https://bugs.kde.org/show_bug.cgi?id=481222
--- Comment #42 from Zk Wang <[email protected]> --- The --scale-from option of xrandr handles screen mirroring issues very well and meets the basic needs when using mirror mode: 1. It maintains the native resolution of the built-in internal display (such as 2K or 4K resolution), ensuring that the speaker does not experience discomfort when viewing the built-in screen. 2. It automatically downsamples the high-resolution content from the built-in display to the highest resolution supported by the projector (typically 1080p), while ensuring that the content displayed on the projector remains **complete** and preserves the aspect ratio as much as possible. >From my experience, the following configuration of xrandr makes mirror mode exceptionally comfortable to use, particularly well-suited for delivering presentations: Suppose the internal display is ePD-1 and the external display (projector) is DP-1, the xrandr command to handle the mirror display is: ```bash $ xrandr --output eDP-1 --auto --pos 0x0 --output DP-1 --auto --pos 0x0 --scale-from 3120x2080[the native resolution of the internal display] ``` FYI, gnome-shell is also not ideal for handling the mirror mode. gnome-shell will reduce the built-in display’s resolution to match the lower resolution of the external display, making the built-in screen look and feel very uncomfortable—windows become overly oversized and the available content area becomes noticeably cramped. -- You are receiving this mail because: You are watching all bug changes.
